Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Deferred tax assets:
Accrued expenses	$ 56,351		$ 43,622
Warranty accrual	25,973		26,296
Deferred compensation	15,776		18,587
Allowance for doubtful accounts	8,280		9,239
Inventories	13,437		12,930
Deferred revenue	14,900		15,101
Pension and post-retirement benefits	48,565		66,222
Finance lease receivables	0		6,210
Tax credits	34,146		23,738
Net operating loss carryforwards	79,300		74,528
Capital loss carryforwards	2,853		3,534
State deferred taxes	13,630		17,341
Other	2,233		5,903
Deferred Tax Assets, Gross	315,444		323,251
Valuation allowance	(92,138)	(39,130)	(57,303)
Net deferred tax assets	223,306		265,948
Deferred tax liabilities:
Property, plant and equipment	15,989		14,369
Goodwill and intangible assets	19,978		41,175
Finance lease receivables	1,042		0
Investment in partnership	12,824		17,056
Undistributed earnings	27,766	42,838	5,016
Other	6,759		3,511
Net deferred tax liabilities	84,358		81,127
Net deferred tax asset	$ 138,948		$ 184,821